[LLVMbugs] [Bug 23624] New: -fsanitize=signed-integer-overflow breaks under optimization

bugzilla-daemon at llvm.org bugzilla-daemon at llvm.org
Thu May 21 14:51:38 PDT 2015


            Bug ID: 23624
           Summary: -fsanitize=signed-integer-overflow breaks under
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: -New Bugs
          Assignee: vonosmas at gmail.com
          Reporter: vonosmas at gmail.com
                CC: llvmbugs at cs.uiuc.edu, richard-llvm at metafoo.co.uk
    Classification: Unclassified

$ cat tmp/ubsan-overflow/a.cc 
int one();

int main() {
  int x = one();  // 1
  int y = x - 0;  // 1
  return x - y;
$ cat tmp/ubsan-overflow/b.cc 
int one() { return 1; }
$ ./bin/clang++ -fsanitize=signed-integer-overflow -O1 tmp/ubsan-overflow/*.cc
&& ./a.out
tmp/ubsan-overflow/a.cc:6:12: runtime error: signed integer overflow: 1 - 0
cannot be represented in type 'int'


I will investigate this issue, reporting here to track progress and share the

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